Portable hoisting-crane.



R. 'w.- HALL.

PORTABLE HOISTING CRANE.

APPLICATION FILED JUNE 16. I917- Patented Feb. 19,1918;

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ROBERT W. HALL, OF GREELEY, COLORADO.

PORTABLE HOISTING-CBANE.

To all whom it may concern:

Be it known that I, Bonner W. HALL, a citizen of the United States,residing at Greeley, in the county of \Veld and State of Colorado, haveinvented certain new and useful Improvements in Portable Hoisting-Cranes. of which the following is a specilication, reference being badto the accompanying drawings.

This invention relates to hoisting appliances, and particularly tocranes and derricks.

The general object of this invention is the provision of a very simplecrane, which is adapted to be readily attached to or detached fromelectric transmission poles, posts, trees and other like verticalsupports, and by which the raising or lowering of objects may beconveniently accomplished.

A further object of the invention is to provide a device of thischaracter which is very simply constructed, may be cheaply made andwhich is portable.

A further object is to provide a device of this character withadjustable clamping means adapted to be engaged with the post,

tree or other support, whereby to hold the portable crane or derrickfirmly in position upon the support.

Other objects will appear in the course of the following description.

My invention is illustrated in the accompanying drawings, wherein Figure1 is a side elevation of my improved hoisting crane in applied positionupon a supporting pole; V

Fig. 2 is an enlarged front elevation of the hoisting crane;

Fig. 3 is an elevation showing the hoisting crane used with a tree as asupport;

Fig. 4 is a perspective view of the clampin attachment used in Fig. 3;

ig. 5 is a sectional view through the supporting member 10, showing oneof the clamping members 22 partly in section;

Fig. 6 is a cross sectional view of the support 10 as formed in twosections; and

Fig. 7 is a top plan view of the member 17.

Referring to these figures, it will be seen that my improved devicecomprises a vertically extending supporting bar, designated 10, which isin the form of a channel bar and made be made either in one piece, asillustrated in Fig. 5, or in two angular sections, as illustrated in.Fig. 6. In the last named Specification of Letters Patent.

Patented Feb. 19, 1918.

Application filed June 16, 1917. Serial No. 175,137.

figure, these two angular sections are designated a and 6. These angularsections are connected to each other by means of rivets, belts or othersuitable connecting devices, but it will be seen that the two angularsections when connected form together a channel iron or bar.

The upper end of the channel bar has riveted to it an angular irondesignated 11, the upper end of which extends outward from the channeliron 10. Preferably the vertically disposed portion of this bar isdisposed within the channel iron 10. The angular end 12 is provided withan opening 13 for the reception of the angular end 14 of a crane arm 15,the extremity of which is formed to provide an eye 16. Riveted orotherwise attached to the side flanges of the channel iron 10 is abracket designated 17 which is formed to provide the laterally spacedportions 18, which are riveted to the side flanges of the channel ironand which are bent to engage over the edges of these flanges and toprovide a relatively contracted neck and a vertically disposed eye 19. Asupporting brace 20 has its lower end disposed within this eye 19 andits upper end swaged, brazed or otherwise connected to the arm '15.

. Riveted to the channel iron 10, immediately beneath the bracket orclip 17, is an angular plate 21. the upper end of which extends outward.Riveted or otherwise attached to the lower portion of the channel iron10 are the two half pole-engaging clamping members 522 and 23. Both ofthese clamping members are semi-circular in form and have laterallyprojecting terminal ends 24, each terminal end being preferably formedwith a longitudinally extending slot 25. Disposed through one slot ofeach clamping member is an eye-bolt 26, which passes through the slotand is engaged by a wing nut 27. Disposed between the wing nut and theterminal end 24 is a sleeve 28. It is obvious that by turning up thewing nut, the eye-bolt may be drawn through the terminal end of eachclamping member to any extent desired. Attached to each eyebolt is achain 29, so formed that the links are adapted to be disposed within theother slot 25 of the clamping member so that a certain portion of thechain will lie transversely to the slot to thus hold the chain engagedwith the walls of the slot and prevent the chains from slippingtherethrough.

In the practical use of this device, as for instance, in applying it toan electric transmission pole, the clamping members are disposed topartially embrace the pole with the bracket 21 resting on top of thepole and when the crane or derrick .has been put in position thereon,the chains are passed around the pole and drawn as tightly as possibleand engaged with the slots 24 and. then the eye-bolts are tightened upso as to tighten the chains around the pole or other support. It willthus be apparent that the attachment is very firmly secured to the poleor other support in such a way that the strain caused by lifting objectswill not cause the detachment of the crane or derrick. It will likewisebe seen from Fig.

3 that it is not necessary "to supply this that this crane or derricksupport with the U-shaped-clamping members disposed partly around thesupport but that the device may be reversed and clamped upon atree sothat the bracket 21 will project outward away from the tree, as will theclamping members.

This hanger, derrick or crane is particularly useful for the purpose ofhoisting transformers and placing transformers in position on the crossarms of telegraph poles, in that this attachment does away with thenecessity of having a lineman on the pole and permits the hoisting andplacing of the transformer plished from the ground, thereby protectingthe linemanfrom a possible shock or' injury from a slip or from son ofthe pole breaking off. use of this portable crane, it requires one ortwo men, according to the size of the transformer, to place thetransformer in position on the cross arm, especially when disposed ontop cross arms. It will be obvious may be used either or a double crossin ury by rea Without the on poles having a single arm.

Where the hanger or crane is to be used on trees, posts, the bracket '21would interfere with the proper positioning of the crane or derrick, Ipreferably provide a clamping attach- Gopies of this patent may beobtained for five cents each, by addressing the Commissioner 01.Iate'nts,

being accomor in other situations, where r ment, such as illustrated inFig. 4E and designated 30.. There are two of these clamping members,each of them formed to provide a middle portion 31, adapted to fitaround the channel iron 10 and having laterally projecting arms whichare longitudi nally slotted as at 32. WVith this means, the ends of thechains 29 may be disposed in the slots 32, the chains tightened up asmuch as possible, and then the weight on the crane will draw the chainstaut, as illustrated in Fig. 3. It will be, of course, understood thatapulley 33 is to be connected to the eye 16 and that suitable tacklewill extend through this pulley.

It will be understood that this device is particularly adapted for useon poles for supporting power transmission conductors and the bracket 21engaging as it does over the top of the pole, is of particular value insupporting the weight of the transformer when it is being hoisted, asillustrated in Fig. 1.

Having thus described my invention, what I claim is A portable cranecomprising a supporting member, an arm swingingly mounted upon thesupporting member, a bracket attached to the supporting member andextending therefrom, and a pair of clamps attached to the supportingmember below said arm and having laterally bent slotted ends, and chainsfor each of said clamps, each chain having attached to one end thereof ashank adapted to be inserted through a slot of the corresponding clamp,the shank being screw-threaded, a sleeve surrounding the shank, anda nutengaging the screw-threads thereof whereby to tighten the chain, the

opposite end of the chain having detachable engagement with the oppositeend of the clamp in the slot thereof. V

In testimony whereof I hereunto my signature in the presence of twowitnesses.

ROBERT W. HALL.

Witnesses: I

Joan J. BEGLEY, 7 JAMES C. Downer.

Washington, D. 0.

